64 lines
1.5 KiB
Rust
64 lines
1.5 KiB
Rust
#![allow(dead_code)]
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#![warn(clippy::unused_io_amount)]
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use std::io::{self, Read};
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fn question_mark<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
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s.write(b"test")?;
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let mut buf = [0u8; 4];
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s.read(&mut buf)?;
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Ok(())
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}
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fn unwrap<T: io::Read + io::Write>(s: &mut T) {
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s.write(b"test").unwrap();
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let mut buf = [0u8; 4];
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s.read(&mut buf).unwrap();
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}
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fn vectored<T: io::Read + io::Write>(s: &mut T) -> io::Result<()> {
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s.read_vectored(&mut [io::IoSliceMut::new(&mut [])])?;
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s.write_vectored(&[io::IoSlice::new(&[])])?;
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Ok(())
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}
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fn ok(file: &str) -> Option<()> {
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let mut reader = std::fs::File::open(file).ok()?;
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let mut result = [0u8; 0];
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reader.read(&mut result).ok()?;
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Some(())
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}
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#[allow(clippy::redundant_closure)]
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#[allow(clippy::bind_instead_of_map)]
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fn or_else(file: &str) -> io::Result<()> {
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let mut reader = std::fs::File::open(file)?;
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let mut result = [0u8; 0];
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reader.read(&mut result).or_else(|err| Err(err))?;
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Ok(())
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}
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#[derive(Debug)]
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enum Error {
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Kind,
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}
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fn or(file: &str) -> Result<(), Error> {
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let mut reader = std::fs::File::open(file).unwrap();
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let mut result = [0u8; 0];
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reader.read(&mut result).or(Err(Error::Kind))?;
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Ok(())
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}
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fn combine_or(file: &str) -> Result<(), Error> {
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let mut reader = std::fs::File::open(file).unwrap();
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let mut result = [0u8; 0];
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reader
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.read(&mut result)
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.or(Err(Error::Kind))
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.or(Err(Error::Kind))
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.expect("error");
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Ok(())
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}
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fn main() {}
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